函数名: setgraphbufsize

功 能: 改变内部图形缓冲区的大小

用 法: unsigned far setgraphbufsize(unsigned bufsize);

程序例:

#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

#define BUFSIZE 1000 /* internal graphics buffer size */

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int x, y, oldsize;

char msg[80];

/* set the size of the internal graphics buffer */

/* before making a call to initgraph. */

oldsize = setgraphbufsize(BUFSIZE);

/* initialize graphics and local variables */

initgraph(&gdriver, &gmode, "");

/* read result of initialization */

errorcode = graphresult();

if (errorcode != grOk) /* an error occurred */

{

printf("Graphics error: %s\", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1); /* terminate with an error code */

}

x = getmaxx() / 2;

y = getmaxy() / 2;

/* output some messages */

sprintf(msg, "Graphics buffer size: %d", BUFSIZE);

settextjustify(CENTER_TEXT, CENTER_TEXT);

outtextxy(x, y, msg);

sprintf(msg, "Old graphics buffer size: %d", oldsize);

outtextxy(x, y+textheight("W"), msg);

/* clean up */

getch();

closegraph();

return 0;

}